Electrical connection and method of forming the same



Dec 18. 1928.

A. G. PLIMMER ELECTRICAL CONNECTION AND METHOD EORIING THE SME- Filedlarch 1926 F794 my; nya. 1 7 .4.

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Patented Dec. 18, 1928.

UNITED s'mr zs 1,696,124 PATENT. O FI E,

mm a. m, or CLEVELAND, onro, ASSIGNOR rro NATIONAL cannon comrnwwmc, ACORPORATION on NEW YORK;

ELECTRICAL commotion Ann mrrnon or FOR-MING 'THE sens.

Liplicationifiledlarch a, 1926. semi No. 92,000. 2

My. invention relates to thatclass'of electrical connections which areespecially useful in uniting flexible metal conductors, commonly made ofcopper strands and known as shunts or pi ails, to carbon brushes orblocks adapte for use on "electric motors and generators and the like,although my invention may be employedin other connections such, forexample, as battery electrodes or contacts for electric switches.

An object of my invention is to )rovide an im roved means for attachinga s unt or pigtai to a brush of the character indicated whereby thebrush and shunt may be easily and quickly assembled in a permanentmanner and with good electrical contac't'between the several parts.Another object of my invention is to rovide a simple and rapid processof assemb ing'brushes which willreduce the amount of machining,especially countersinlo in necessary on the brush.

hese'and further objects of my invention will be evident from thefollowing description havin reference to the annexed drawin inwhic r ig.l'is a frontelevation of a'brush and conductor showing one embodiment ofmy invention; p

2 is a vertical section on: the line-2-2 Fig. 3 is an elevation of thegripping means employed in my invention, the gripping means being shownbefore deformation;

Figs. 4 and 5 are elevations of two interlockingmembers which ma besubstituted.

for the single 'pping mom r of Fig. 3;

Figs. 6 and 8 and 9, and 10 and 11, show three other pairs ofinterlocking members which also may be substituted forthe'singledeformable gripping member of Fig. 3;

Figs. 12 and 18, 14 and 15, and 16 and 17 show pairs of non-interlockingmembers which also may be substituted for the single deformable member;

Fig. 18 is a front elevation of another type of deformable gripping"member;

Fig. 19 is a vertical section taken on the to compress the shunt betweenthe gripping member and a portion of the carbon block,

JVlllCh does not give as secure a connection and as low a resistance asthat disclosed herein, or to form the shunt with a special terminal, inwhich case it is necessary to form a countersunk hole to take thespecial terminal and its grippingfastening.

. In carrying out the method which results in the type of connectionshown in Figs. 1 and2 a cable or conductor 23 is secured to a brush24'Which may consist-of carbon, mixture of carbon and copper, etc. Thebrush 24 is provided with a passage 25 and a pas sage 26 extendingthrough the brush and intersecting the passage 25. The gripping member27, best shown in ig. 3, is formed of copper, brass or similardeformable conducting material in the shape ofa spool having endportions 28, 28 connected by a neck portion 29. The gripping member 27is placed in the passage 26 and an end of the conductor 23 is theninserted through the passage 25 into the passage 26 between the endportions 28, 28, after which the latter are forced together to grip theconductor end therebetween, flattening and spreading the conductor. Theforce employed may be such as to expand the end portions 28, 28outwardly into contact with the wall of the passage 26,thus forming goodelectrical. contact with the brush 24. However, this is not necessary,as in any event after the conductor has beensecured in place by thegripping member 27, the connection and adjoining parts of the brush willbe suitably copper coated and tinned, providing a firm mechanicalconnection having low electrical reextend the passage 25' beyond thepassage 26 as M25 in which case there will be an un'deformed portion '23of the cable below the gripping member, thus more firmly securing thecable.

In Figs. 4 and 5, I show a rivet 31 and washer 32 which may replace thedeformable gripping member 27. Where these members are usedit isimmaterial whether the cable 23 is inserted in the hole 25 before orafter against the washer n "1 6 and T, I show a split rivet and a unablewasher n no, this rivet at d washer dnetor in the and wa 31.

show a rive :38 having an .e. i iUl'. till 1; thin wall ll) oi eess lll0 and f ing wa flanges l irictiona ipping the conas do the rivet Figs 8and 9, I her :38 the WZlSllQl "3-9 ther in. Upon the washer till bed itwill be in members iipon "bdi'il'ltlllS in coppering the eab n ing takes1 l2 and and li )er in which types *l. the 'lrietional eontae upon thep: the grippi" i i V l:, WW1 teppeinie ZiiiLL l ning oeenr. hi1 figs. i

and il are prorit ed with nanges 45. These flanges have slots 46 wherebythe flanges may be sprung outwardly against the wall thus holding themembers in i the cable 23. In Figs. 1 end 1-3 the cable grippin members51 and 5 iare grooves 51:3 on their opposing sur- 1 ees. In Figs. 16 and17 one member 54 of the pair of. gripping members has a proie'tionthereon which is designed to registhe member:

\.1 ter rith a recess on. the opposed member FT. It is designed that inthis modification of my invention the cable shall. pass across thecenter ot the gripping members and be T I 1S and 19, 1 show anotherdepping member, this menmer i':-e-

.. 'i i show i in .5111. 3 except that d P .ap the era gripping memberis hireed into the hole (52 and the whole secured in .ne latter bytopiering and tinning.

While I have shown my intention in nuinerons elnbmliments, i

i ose skilled in OR. rarions other changes l he art intention.

What I claim is:

l. A conducting; body hating intersecting pas iges therein, a co:dot-tor in one of said pas" res, means in the other passage for grippingsaid eondnrtor. said dripping means comprising a single pieee o'tde'fi'irinahle naterial baring; opposed abatments grippin; saidconductor therebetween.

2. i method. of attaching conductors to i bodies which comprises harminginteretnnr passages in said body; placing a deable meitnbei. havingspaced oppo, l ments in one of said passag; s; inse 5; said conductorthrough the other of Stlti. passages into the fil'StlnQflt'lOHQdpassage, with a portion thereot between said abutments; and deformingsaid member whereby said conductor is gripped between said abntments.

A conducting body having a groove in one face thereof and a recess insaid fave (tomnnnieating with said groove, :1 single gripping member insaid recess, said gripping member hating opposed abntmmls. a (able insaid grooi'e and between said abntnzen s. said abntments gripping saidcable.

4. A conducting body having a long]- tndinal passage and an openingintersoeting said passage at an angle thereto, a eondn tor extendingthrough said pa age into said openingand gripping means in said opening,said gripping means having a portion (laced cross section disposed opppassage the non-reduced. portion-i abntments for engagement with thevendortor.

In. testimony whereof, I atlix' my signature.

